Tutorial by Topics: nio

UNION keyword in SQL is used to combine to SELECT statement results with out any duplicate. In order to use UNION and combine results both SELECT statement should have same number of column with same data type in same order, but the length of column can be different. SELECT column_1 [, column_2 ]...

Quaternion.LookRotation(Vector3 forward [, Vector3 up]); Quaternion.AngleAxis(float angles, Vector3 axisOfRotation); float angleBetween = Quaternion.Angle(Quaternion rotation1, Quaternion rotation2);

Unions are very useful tools, but come with a few important caveats: It is undefined behavior, per the C++ standard, to access an element of a union that was not the most recently modified member. Although a lot of C++ compilers permit this access in well defined ways, these are extensions an...

UNION DISTINCT -- dedups after combining the SELECTs UNION ALL -- non dedup (faster) UNION -- the default is DISTINCT SELECT ... UNION SELECT ... -- is OK, but ambiguous on ORDER BY ( SELECT ... ) UNION ( SELECT ... ) ORDER BY ... -- resolves the ambiguity UNION does not use multiple CP...

Useful Apple documentation with examples and clarification.

SELECT column_name(s) FROM table1 UNION SELECT column_name(s) FROM table2; SELECT column_name(s) FROM table1 UNION ALL SELECT column_name(s) FROM table2; SELECT column_name(s) FROM table1 WHERE col_name="XYZ" UNION ALL SELECT column_name(s) FROM table2 WHERE col_name="XYZ&qu...

SelectionKey defines the different selectable operations and information between its Selector and Channel. In particular, the attachment can be used to store connection-related information. Handling OP_READ is pretty straight-forward. However, care should be taken when dealing with OP_WRITE: most...

Union types are used in several languages, notably C-language, to contain several different types which can "overlap" in the same memory space. In other words, they might contain different fields all of which start at the same memory offset, even when they might have different lengths an...

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